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V-204457

CAT II (Medium)

The Red Hat Enterprise Linux operating system must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.

Rule ID

SV-204457r991590_rule

STIG

Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Version

V3R15

CCIs

CCI-000366

Discussion

Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.

Check Content

Verify the operating system defines default permissions for all authenticated users in such a way that the user can only read and modify their own files.

Check for the value of the "UMASK" parameter in "/etc/login.defs" file with the following command:

Note: If the value of the "UMASK" parameter is set to "000" in "/etc/login.defs" file, the Severity is raised to a CAT I.

# grep -i umask /etc/login.defs
UMASK  077

If the value for the "UMASK" parameter is not "077", or the "UMASK" parameter is missing or is commented out, this is a finding.

Fix Text

Configure the operating system to define default permissions for all authenticated users in such a way that the user can only read and modify their own files.

Add or edit the line for the "UMASK" parameter in "/etc/login.defs" file to "077":

UMASK  077